What is the role of the Edge Transport Server?

The role of the Edge Transport Server is primarily to handle external email traffic, which includes both the sending and receiving of emails from outside the organization's network. This server acts as a gateway that manages all incoming and outgoing mail flow for the organization and provides security by enforcing email policies, filtering out spam, and protecting against potential threats.

By managing external email communications, the Edge Transport Server is crucial for ensuring that email services are reliable and secure, making it a foundational component in maintaining effective email operations within an organization. The other options, which pertain to user authentication, file storage, and inventory management, do not align with the core functionalities associated with an Edge Transport Server.